thinks that it did. first if he was able to hack into engine controls or control the engine what would have happened. presumably during the cruising phase of fight where the autopilot was on. on most air crafts, pilots fly with auto pilot on all the time. any change of control of the engine, had he changed the engine would hatch caused the autopilot to go off and shown up as a mall function. and the pilots would write it up as squawk, or repair item in pilot log books. i don't think the engines were compromised. when you turn a plane you don't go side ways. you turn the plane, turns like, like a motorcycle in a banked curve. i don't think that really happened. >> and boeing has also cast doubt on chris roberts' claims. airbus has not commented. but preaviously said it had security measures in place. >> we'll take a very short break here. still to come, a look at what's in store for those left behind